2019 — 2023
3.0L Turbo - E450
Petrol
Engage the adaptive air suspension (if equipped) and toggle through the drive modes while stationary and moving. Listen for any hiss or delay in leveling, as air struts are complex components that can exhibit age-related wear.
Gently accelerate through the lower gears and listen for any hesitation; the 9G-TRONIC transmission should be seamless, so any clunking or erratic shifting may suggest the transmission mounts or valve body could eventually require attention.
While the engine is at operating temperature, perform a cold start if possible to listen for any metallic rattling from the engine bay, as the M276 3.0L V6 timing chain tensioners are components to keep an eye on during high-mileage ownership.
Test every function of the MBUX infotainment screen and the touchpad controller. These systems are highly integrated; check for any freezing or flicking displays, as these electronic modules can sometimes be sensitive to software updates or connection issues.
Recommended transmission fluid and filter flush to ensure continued smooth shifting.
Consider a full cooling system health check and inspection of accessory drive belts.
Primary service interval for spark plugs and a comprehensive inspection of suspension bushings and engine mounts.
Maintain a strict adherence to European-spec oil change intervals every 10,000km to protect the turbochargers.
Periodically check the panoramic sunroof seals and drainage channels to prevent moisture ingress.
Keep the vehicle's software updated at an authorized service centre to ensure the MBUX system remains responsive.
Inspect the brake pads and rotors regularly; the E450's performance capabilities can lead to faster wear on consumables compared to smaller engines.
Ensure the battery health is monitored, as the complex electrical architecture requires a strong charge to prevent phantom warning lights.
Estimated repair costs if issues arise
If the vehicle is equipped with air suspension, it's common to consider that these components have a finite lifespan. Depending on the car's history, you might eventually need to budget for the replacement of air struts or the compressor to maintain the signature ride quality.
To keep the 9G-TRONIC transmission performing at its best, future budget planning should include a professional fluid and filter service. This preventative step helps ensure the longevity of the gearbox electronics.
In cars of this age, it is worth keeping an eye on the cooling system. If this component needs attention in the future, it involves replacing the pump and thermostat housing to prevent overheating issues.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer